Discusses the patterns of time, length and mass of the SI and their respective units. Cites the INMETRO is the federal agency responsible for the standardization of physical measures in Brazil, among other things

The materials indexed by Core Interactive Digital Objects of the Institute of Mathematics of the Federal University of Rio Grande do Sul are under the Creative Commons license. These materials can be accessed through the search system - online repository, which lets you view, copy and comment on the contents published. For more information about the license visit http://creativecommons.org/licenses/by-nc-sa/3.0/br/